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    <!-- 题目4: 写一个函数 parseQueryString，它的用途是把 URL 参数解析为一个对象
    函数名：parseQueryString
    参数：URL字符串
    返回值：URL字符串解析后的对象
    例如：parseQueryString("admin=user&pass=1234") 返回 {admin:"user",pass:"1234"}
-->
</body>
</html>
<script>
    function parseQueryString(str){
        let arr = str.split("&");
        let str1 = "";
        let json = {};
        for(let i=0;i<arr.length;i++){
            str1 = arr[i].split("=");
            for(let j=0;j<str1.length;j=j+2){
                json[str1[j]] = str1[j + 1];
            }
            str1 = "";
        }
        return JSON.stringify(json);
    }
    console.log(parseQueryString("admin=user&pass=1234"));
</script>